What term denotes a data value used to identify a record uniquely in a table or relation?

Autopia is a perfect place which is impossible - there is no way that such a place could possibly exist.sir thomas more once wrote his utopia where he portrayed a seemingly perfect society where there was no crime, no pain, no suffering, famine, lack of any resources. however, it turned out that these people lived in a dictatorship and didn't know that their lives were actually bad. my vision of a utopia would include a similar thing - no hate, wars, pain and suffering, a place where everyone would be happy and satisfied. however, unfortunately, that is impossible.